Box tool



March 27', 1951 K. o. FELLROTH 2,546,853

BOX TOOL Filed Sept. 8, 1947 4 Sheets-Sheet l I2 INVENTOR,

War/7 5/ March 27, 1951 o. FELLROTH 2,546,853

BOX TOOL Filed Sept. 8, 1947 4 Sheets-Sheet 2 March 27, 1951 O. FELLROTH2,546,853

BOX TOOL Filed Sept. 8, 1947 4 Sheets-Sheet 3 I I4 55 i/ 49 1 23 78 I fv I U "I" i I I IN VEN TOR.

March 27, 1951 K. o. FELLROTH BOX TOOL Filed Sept. 8, 1947 4Sheets-Sheet 4 JNVEN TOR.

A 177/ [EV/r21 1? being had to the drawings.

Patented Mar. 27, 1951 UNITED STATES PATENT OFFICE BOX TOOL Karl O.Fellroth, Minneapolis, Minn.

Application September 8, 1947, Serial No. 772,820

4 Claims.

My present invention in box tools.

The principal object of this invention is to embody in a single-tool,applicable to a turret lathe, a screw machine and the like, all aroundversatility for different kinds of bar turning and due to novelarrangements of pressure rollers relates to improvements and adjustabletool bits, this box tool is capable v of doing in one operation the workof a plurality of independent tools and eliminates the necessity ofadditional complex tooling up and allows tool set-ups that are otherwisenot feasible.

diameters; that are concentric, the one with the other.

" Still :another object of this invention is to provide a box tool thatis not cumbersome, does not occupy too much space on a machine so thatcomplex set-ups are possible without bumping into side tools andbreaking them.

A further object of this invention is to provide a box tool havingconstruction design that insures a rigid tool that does not shimmy,weave,

chatter or have a jumpy feed.

A still further object of this invention is to provide a box tool havingmeans for adjusting pressure rollers and tool bits so arranged as toface the operator and thus facilitate set up.

Another object of this invention is to provide a boxtool having workpressure rollers designed, arranged and mounted to exert equal pressureon tool'bits engagingwork at circumferentially spaced'points allowinglong cuts and holding concentricity. h

Other objects of this invention "will be apparent from the followingdescription, reference To the above end, generally stated, the invehtionconsists of thenovel devices and combination of devices hereinafterdescribed and defined'in the claims.

In the accompanyin drawings, which illustrate the invention, likecharacters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a front elevational view of the improved box tool;

Fig. 2 is a left side elevational view of the same; Fig. 3 is a rightside elevational view of the 'same the other is to the left thereof. aremounted in transverse holes in rectangular Fig. 4 is a top plan view ofthe improved box tool;

Fig. 5 is a bottom plan view of the same;

Figs. 6, 7 and 8 are views principally in transverse vertical sectiontaken on the irregular lines t -5, T'i and 8-8 of Fig. 3, respectively;

Fig. 9 is a longitudinal vertical section taken on the line 9-4! of Fig.l;

Fig. 10 is a fragmentary detail view principally in section taken on theline [0-H] of Fig. 1;

Fig. 11 is a detail view principally in section taken on the line Hil ofFig. 1; and

12 is a detail view principally in section taken on the line I2l2 ofFig. 2.

The improved box tool 13 has an elongated rectangular body M providedwith a compartment it. The top and left-hand side of the body !4 areopen to afford access to the compartment l5, and. the latter affords achip escape passageway. On the front end members E6 of the body I4 is anupstanding extension member H, and on the left-hand side of said endmember is an outwardly projecting extension l3. Both of the extensionsI! and I8 are integral with the end member I6.

In the front end member 6, at the center thereof, is an annular workpassageway I9 that leads into the compartment I5. On the face of thefront end member 16 and integral therewith is a tool post 2i! and a toolpost 2|. The tool post 29 is at the right of the work passageway l9 andthe tool post 2! is below said passageway. The two tool posts 26 and 2|are spaced apart to leave a chip escape passageway 29' therebetween.From a broad viewpoint, the tool posts 20 and 2! may be treated as asingle post having a transverse chip escape passageway 20'.

Projecting rearwardly from the rear end member 22 of the body I 6 is atubular shank 23 for mounting the improved box tool on a turret lathe, ascrew machine or a-sirnilar machine, not shown. This shank 23 is axiallyaligned with the work passageway I 9 and its inner end portion istightly fitted in a hole in the rearend member 22. Integral with theshank 23 is an annular flange 24 that bears against the rear end member22 and is detachably secured thereto by a plurality of cap screws 25.

' Two work-engaging pressure rollers 26 are journaled on headed'st'uds21, the axes of which are parallel to the projected axis of the workpassageway l9. One of these rollers 25 is above the projected axis cfthework passageway l9 and The studs 27 carriers 28 and secured thereto bypins 29, see Fig. 10. These carriers 28 are slidably mounted in guidechannels 38 in the face of the front end member IE. One of these guidechannels 35: extends com-pletely through the extension l'i and the otherextends completely through the extension [8.

Movement of the carriers 28 carries the pressure rollers 26 thereontoward or from the projected axis .of the work passageway I9. Thecarriers 28" are rigidly held in the guide channels 30, where adjusted,by nut-equipped bolts 3| that extend through holes 32 in said carriersand longitudinal slots 33 in the front end member l5 and the extensions[7 and Id. The heads 34 of the bolts 3| are rectangular .iandiheldiincorrespondingly formed seats 35in. the carriers 28 and thereby hold thebolts 3i from turning; Motion is imparted to each carrier 28 by longadjusting screw 38 to position the rollers 26 on a piece of work at thework passageway l9. These adjusting screws 36 extend parallel to thecarriers .23 and have threaded engagement with the front end member Hi.An annular collar 3"! on each adjusting screw 36 extends into atransverse notch 38 in the adjacent carrier 23 and couples said carrierto the respective screw 36.

Formed in the tool post 20, the front end member I6 and the right-handside member 39 of the body it is a horizontal row of laterally spacedseats 49, ill, 42, 43 and 44. These seats 45, 4|. 42, 43 and 44 aresquare in cross-section and extend substantially radially relative .tothe axis and the projected axis of the work passageway 19. The

seat 49 is in the tool post 20 and extends comhand side member 39 andopens into the work passageway I9 and the compartment :5. Both seats 43and 44 are in the right-hand side member 39 and open into thecompartment [5.

Upright set-screws 45, above the seats 49, 4|

42, 43 and 44 are provided one of each of saidv seats for looking a toolbit therein. These setscrews 45 are mounted in bores 46 and havethreaded engagement with the tool post '20, the front end member 46 andthe right-hand side member 39.

Formed in the tool post 2 I ,the front end member It and the bottommember 47 of the body [4 is a horizontal row of upright tool bit seats48, 49., 5i], 5.! and 52. These seats 48 49, 5e, 5| and 52 extendsubstantially radially relative to the axis and theprojected axis of thework passageway l9, are slightly inclined transversely of said axis, andare-square in cross-section. .The seat 118 is adouble seat-for two toolbits or a tool bit and a spacer, This sea-t 4.8 is formed in part in thetool post 21 and in partin the front end mem- ;;ber 16 and extendscompletely through the tool .post 2] and :is open, in part, to the workpassageway IS. The seat 4-9 is formed in the front end member I6 and isopen to the work passageway 19 and the seats .50, 5| and 52 are formedin the bottom member 41 and are open to the compartment [5.

- Set-screws 53 are provided, two for the double seats; and one for eachof the seats d9, .50, 5] and52 for locking tool bits therein. These set-.screws .53 are mounted bores 54 in the tool post 21, the front endmember i6 and the bottom member 41. In addition to the set-screw 45 for.ldcking a tool bit the seat 40 is a-second set.-

screw 55 that extends at right angles to the setscrew 45 and hasthreaded engagement with the tool post 20. Also in addition to the twosetscrews 53 for the double seat as is a third setscrew 56 that extendsat right angles to said setscrews 53 and has threaded engagement withthe tool post 2|.

Within the compartment [5 is an upper pressure back roller 51 and a leftside pressure back roller 58 for holding work when long cuts are made.I'hese two pressure rollers 5'! and 58 are mounted on headed studs 59that extend parallel to the projected axis of the work passageway Hi.The studs 59 are tightly fitted in transverse holes to in carriers BIand secured thereto by pins 62. Thellcarriers fii are mounted in guidechannels .53 .inthe faceof a frame 64 in the compartment .Ihe carriers6| are rigidly held in the guide channels 63 where adjusted bynut-equipped bolts 3. 5 that extend through holes 56in saidcarrier andlongitudinal slots 67 in the frame .64. The heads 68 of the bolts arerectangular and are mounted in correspondingly formed seats 69 in thecarriers BI and hold the bolts 65 from turning. The frame 64 extendstransversely of the compartment I5, rests on vthe bottom member '41 andhas a depending rectangular extension 1-!) that extends into alongitudinal slot II in said bottom member with a working fit andthereby holds the frame 64 for straight-line sliding ad justment.

A screw l2 extends through the slot ll, has threaded engagement'with theframe extension iii and is provided. with a collar 13 that bears againstthe under side :ofithe bottom .mcmberxfl as .a base of resistance forthe screw- 12.

Each carrier BI is :moved in its guide channel 63 by a long adjustingscrew 74 having threaded engagement with the frame 54. On each screw i4is a collar "15 that extendsinto a transverse notch 16 in the respectivecarrier BI and couples the screw it to said carrier.

In the drawings is shown a round bar a to be turned by the improved boxtool 3 to form on said bar a series of steps of different predeterminedlengths and different predetermined diameters. This bar a is fed to thebox tool l3 "by the machine, not shown, on which said box tool ismounted.

As is well known, a commercial round bar, as it is held in a machine tobe turned is not absolutely true circumferentially or concentric to theaxis offlthe box tool and hence a slight short cut, as indicated at b,is necessary to reduce the diameter of the bar a to bring the same intoconcentricity. .It is also necessary to make thisshor t initial cut 21before the pressure rollers .28 are adjusted onto bar a .order thattheyhold thefba'r a concentric as the turning progresses. This initial cutI) is made by the tool bit .17- vforwa r.d of the pressure rollers 25and while said pressure rollers are retracted. At the completion of thecut-b, the pressure rollers 28 are adjusted onto the periphery of saidout. The second step in turning the bar a is to cut a relief 0 whichisdone by the tool bit TF8 fortunther reducing the diameter-of the bar ato a predetermined length, as indicated at .d. The third step in'turningthe bar a is to further'reducefthe diameter of the bar a for apredetermined length by means of the tool bit 80,, as indicated at e.The fourth and final step in turning the bar a is to still furtherreduce the diameter of thel bar a to a predetermined length, asindicated at f, by the tool bit 8|.

It may be assumed that the pressure back rollers 58 are retracted and atthe time the inner end of the section 1 of the bar a is fed under saidrollers and then they are adjusted onto the periphery of said section f.These pressure back rollers 58 serve a very important function in thatthey securely hold the bar a at its inner end portion concentric to theprojected axis of the work passageway [9, thus making it possible tomake long deep cuts in the bar a.

It will be understood that the invention described is capable of variousmodifications within the scope of the invention herein disclosed andclaimed.

What I claim is:

1. In a box tool, a body member having a compartment and a workpassageway in communication with the compartment, a frame in thecompartment mounted for adjustment longitudinally of the projected axisof the passageway, two pairs of carriers mounted, the one pair on theface of the body member and the other pair on the frame for adjustmentson substantially radial lines extending from said axis, a pair of postson the face of the body member parallel to said axis, a row of laterallyspaced individual tool bit seats in each post and the body memberparallel to said axis, certain of the seats leading into the passagewayand the others leading into the compartment, said rows of seats beingdiametrically opposite the pairs of carriers on the face of the bodymember and arranged to hold tool bits for adjustment substantially 0nradial lines extending from said axis, means for locking the frame whereadjusted, and other means for locking tool bits in the seats.

2. The structure defined in claim 1 in which I the tool bit seats in thetwo rows are staggered.

3. The structure defined in claim 1 in which the distance between theseats in each row is materially less than the width of said seats and inwhich the seats in the two rows are staggered, whereby overlapping cutscan be made.

4. The structure defined in claim 1 in which the seats in each rowextend from the plane of the carriers on the face of the body membersubstantially to the carriers on the frame when said frame is in itsrearmost position.

KARL O. FELLROTH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 258,907 Flower June 6, 1882309,871 Palmer Dec. 30, 1884 748,726 Hanson Jan. 5, 1904 1,683,253McConnell Sept. 4, 1928 2,321,281 Collins June 8, 1943 2,369,014 BrunsFeb. 6, 1945 2,389,858 Kyle Nov. 27, 1945

